How does the different molecular size of hyaluronic acid in this serum work? — Modo Face Serum with Hyaluronic Acid, 30 g-Modum

The serum uses three different forms of hyaluronic acid that work at different levels of the skin's surface. High-molecular hyaluronic acid stays closer to the top layer, forming a thin, invisible film that helps reduce water loss, giving the skin a smoother feel and more hydrated appearance. Medium-molecular hyaluronic acid helps maintain the extracellular matrix, a supportive structure around skin cells that contributes to the skin looking fuller and more elastic. Low-molecular hyaluronic acid can reach deeper surface layers more easily, where it helps improve hydration and creates conditions in which the skin can better maintain firmness and bounce. This multi-level approach allows the serum to address surface dryness and deeper dehydration, which is why it is suitable for skin that feels tight or looks dull after cleansing or exposure to dry air from heating or air conditioning.

For best results, apply the serum to cleansed, slightly damp skin before your moisturizer, as hyaluronic acid works by drawing moisture into the skin. If your environment is very dry, sealing it in with a cream is essential to prevent it from pulling moisture from the skin itself.